For efficacy, the primary outcome variable will be changes in the Abnormal Involuntary Movement Scale (AIMS), and a baseline score of >3 ('moderate') will be required for item 8 (Severity of Abnormal Movements). Quantitative evaluation of movements will be carried out in two ways. The first involves a series of instrumental and clinical measures that were developed as a battery for the assessment of antipsychotic-induced parkinsonism and TD. The second means of quantifying the movements involves the use of video recording, with independent evaluation by several raters (Appendix I). Such approaches have gained popularity in the quantification of movement disorders as a means of improving reliability.